Safety-valve.



T. B. NICKEL.

SAFETY VALVE.

APPLICATION FILED .11111.21 1914.

Patented Oct. 27, 1914.

u ,v/ 1 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\.i S

Inventor Attorneys sTATEs PATENT oEEIoE. l'

SAFETY-VALVE.

Specification of Letters Patent.

Patented oct. 27, 1914.

Application tiled January 23, 1914. Serial No. 813,959.

To all whom t may concern Be it'known that I, THOMAS B. NICKEL, a cit` of the United. States, residing at Mc racken, in the. county of Rush and State of Kansas, have invented. a new and useful Safety-Valve, of which. the following is a.; specification.

This`invention relates to safety valves and more particularly to" a vlve to be used in connection with automobile tires wherein-the pressure willy be relieved'ify it riSeSl t0 exs cessive values and at thel` Sametimeprovides a valve through which the air may be introduced while umpingl up the tire.

An object of tlile resent invention is to provide an improve form of safety valve which in addition to providing an escape for excessive pressures .of airl within automobile tires, also provide an automatic shut-off valve through which airmay be introduced for the pumping up of tires.

' A further object is to provide an improved safety valve for pneumatic tires in which the pressure at which the valve releases may be adjusted.

With the foregoing and other objects in view which will appear as the description proceeds, thev invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and'` claimed, it being understood that changesfin the precise embodiment of the invention herein disclosed can be made within the scope of what is clalmed, without departing from the spirit of the invention.

In the drawings accompanying this speci cation and yorming a part thereof, the preferable em odiment of my invention is illustrated, in which g Figure 1 is a'longitudinal sectional view of my improvedavalve. Fig. 2 is ai transverse view theredf taken on the line 2-2 of Fig: 1. Fig. 3 isa similar View taken on the line 3-3 of Fig. 1`.

Referring to the drawings in which similar reference numerals designate corresponding parts throughout the several views, 5 is the inlet pipe to a pneumatic tire and to which my improved valve is threadedly secured. Y

The valve proper includes the main body portion 6 which is provided with the bore 7 extending longitudinally therethrough and which bore is enlarged at one end as at 8.

'.The body portion with the bore extending theret-hrough therefore defines a casing, -t which casing is internally threaded as at 9. A valve plunger 11 is slidably disposed within the bore 7 and is provided with' the enflarged head 12 which rests upon a ground jseat 13 formed in the side wall of the casfing. r1"he valve plunger when it contacts 'gwith the valve seatcloses` the bore 7 and prevents'the escape of air from the tire 4. In order to hold the valve .head and plun i, ger ina closed andv seated condition, the plugr t114 is threadedly secured to the adjacent end i9 of the casing and is provided with the bore j 15 extending longitudinally v therethrough.

|An adjusting nut 1d. threadedly engages the fbore 15 and forms an abutment for a com- 1 pression spring 17, the remote end of which rests upon the extreme end of the valve plun` ger 11. In order to impart a large degree of resiliency to the spring17 so that it/will when the valve is unseat'ed, opengto a large extent, the valve plunger is providedwith the bore or opening 19 extending longitudinally therethrough in which the compression spring is secured. The force of holding Vthe valve head upon the valve seat may thus be varied or adjusted by the adjusting nut 16. A top 20 threadedly engages the casing 6 and houses the adjusting nut and plug` 14 therein.

The adjacent extremity of the top or cover 20 is internally threaded as at 21 and in which ts the cap 22. Thecap -is provided with the openln 23 extending therethrough which allows 01' the escapemerit of the air when the valve is released. In order to prevent theaceumulation of dirt'and objectionable material within the cover and `various parts of the valve, the head 24 is provided and which 'carries a shank 25 which fits down within `the opening 23. The head is resilientl held` in place by the spring member 26 which is' secured to the knob 27 of the cap. Thus the head will resiliently close the` opening 23 to the entrance of objectionable material therein but will allow fortlle free passage of air therethrough which is released from the tire.

The adjusting nut 16 is rovided with the opening 28 extending t erethrough and which communicates with the bore 19 of the valve plunger, The lower extremity of the bore 19 in the valve plunger is resiliently closed by the valve check member 29 which. is resiliently held in place by the tension spring 30, the latter being secured to the spider 31 of the valve plunger. Thus when it is desired to pump air into the tire, the cap 22 is removed and the air hose is directly connected to the threaded end 21 of the cover. The air passes down through the bores 28 and 19 and through thecheck valve Q9, provided that the internal or v:tir hose pressure is greater than the internal pressure on the t-ire.

From the foregoing it will be apparent that air may be introduced to the valve herein disclosed and will, under normal conditions7 be prevented from escaping therefrom. However, if the pressure rises to ex- Cessive and dangerous values, the pressure upon the valve plunger will be sullicient to overcome the compressive stress of the spring 17 and will raise the valve plunger from its seat and allow for the escapement of nir which passes out through the central bore of the plug 14 and also through u number of V-shaped notches 32 which are cut in the side Walls thereof. The air escapes to the atmosphere through the bore 28 of the cap.

Having thus described my invention, what is laimed is Copies of this patent may be obtained for five cents each, by addressing tre Cfu nut A valve compris plunger disposed the; sure fouille casing', t :dile in one direction vulve carried by smid in an opposite diret-ti ger, a plug secured in of said casing :ind in: bore extendingl th with :i boro threadefliy engeren ing nut exlending; ger sind guidingy :u i to rectilinear n'ivfitim.. i disposed within sei( with the bottom uni 15m said adjusting nui, un enlarged bore rtreinity ofthe plm ingr :i abutment tl ln testimony fluit my cwn7 I have. new` in the presence of tu o W itnesses t JAS. JoHNsoz; B. F. Kimisif,

Washington, D. C. 

